AIM: To study the influencing factors of try-in rigid gas permeable(RGP).

METHODS: A retrospective study was performed examining the data of 120 patients(240 eyes)with myopia who had tried the RGP.

RESULTS: After trying in the RGP, out of 120 patients(240 eyes), 212 eyes(88.3%)had successfully wearing RGP, with 103 eyes(42.9%)satisfied with one piece of trying, 89 eyes(37.1%)satisfied with two pieces of trying, 16 eyes(6.7%)satisfied with three pieces of trying, there were 2 patients 4 eyes(1.7%)after many times of trying was satisfied with twice, but there were 24 eyes(10.0%)were dissatisfied after a lot of attempts, and there were 2 patients 4 eyes(1.7%)gave up the attempt after repeated failure.

CONCLUSION: According to corneal curvature and the degree of myopia to select the first glasses, choose the right of the patients and normative operation are the key points of success on regular try- in the RGP.